Finding the Fourth Proportional to 1,555.02, 2,145.88 and 856.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.02 : 2,145.88 = 856.38 : x
2. Step 2: Convert to fraction form
   1,555.02/2,145.88 = 856.38/x
3. Step 3: Cross multiply
   1,555.02x = 2,145.88 × 856.38
4. Step 4: Simplify right side
   1,555.02x = 1,837,688.71
5. Step 5: Solve for x
   x = 1,837,688.71/1,555.02
6. Step 6: Final answer
   x = 1,181.78